Fix namespace for src/ui/display/.

ui/display/manager/chromeos/x11/display_mode_x11.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/memory/ptr_util.h"
 
 #include "ui/display/manager/chromeos/x11/display_mode_x11.h"
 
-namespace ui {
+namespace display {
 
 DisplayModeX11::DisplayModeX11(const gfx::Size& size,
                                bool interlaced,
                                float refresh_rate,
                                RRMode mode_id)
     : DisplayMode(size, interlaced, refresh_rate), mode_id_(mode_id) {}
 
 DisplayModeX11::~DisplayModeX11() {}
 
 std::unique_ptr<DisplayMode> DisplayModeX11::Clone() const {
   return base::WrapUnique(
       new DisplayModeX11(size(), is_interlaced(), refresh_rate(), mode_id()));
 }
 
-}  // namespace ui
+}  // namespace display